diff --git a/src/locales/ja.json b/src/locales/ja.json
index 516b93e5..4b5d4a38 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -160,7 +160,8 @@
         "creator_replied": "投稿者が返信",
         "creator_liked": "投稿者が高評価",
         "invalid_input": "入力が無効です",
-        "playback_speed": "再生速度"
+        "playback_speed": "再生速度",
+        "prefer_hls": "DASHよりHLSを優先"
     },
     "comment": {
         "pinned_by": "{author} によって固定",